[PRECISE READINGS] This tester features a 2-digit LCD display that provides accurate readings in increments of 01% BAC and 0.05 mg/l, giving you confidence in your results. [FAST AND EFFICIENT] Designed for quick response times, this device is ideal for those who need to test their levels repeatedly while on the move. [LOW LIGHT FRIENDLY] The orange backlit display ensures visibility even in dimly lit environments, with additional options available for different backlight colors or none at all. [CONVENIENT KEY RING ATTACHMENT] The included key ring makes this tester portable and easy to store, perfect for carrying in your pocket or on your keys.